2002 SantaFe is hard starting only when motor is fully warmed up

It will start up great when its first started, but , lately...its hard starting when its got a warm engine. The red battery indicator light comes on on the instrument panel but the battery is brand new and was
doing it before i replaced the battery. Most of the time, the check engine indicator light will also come on as im cranking. Once it starts, its rough for about 3 seconds then smooths out. No driveability problems though. Any thoughts on this ? It has 48,000 miles on it . Thanks, David.
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Hi, If your battery light is staying on, the primary problem is that your charging system is not working properly and not charging the battery fully. That needs to be checked at a dealer, shop, or even a parts place. The reason it would start slower when hot is that the starter is attached directly to the engine so it gets hot also. With increases in heat the resistance of the starter motor's windings goes up. This restricts the flow of current, hence slows the starter motor down and gives it less power to start your engine. With your lower battery voltage, this makes the matter even worse.

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your battery light is staying on, the primary problem is that your> charging system is not working properly and not charging the battery fully.> That needs to be checked at a dealer, shop, or even a parts place. The> reason it would start slower when hot is that the starter is attached> directly to the engine so it gets hot also. With increases in heat the> resistance of the starter motor's windings goes up. This restricts the flow> of current, hence slows the starter motor down and gives it less power to> start your engine. With your lower battery voltage, this makes the matter> even worse.> >

lately...its hard> > starting when its got a warm engine. The red battery indicator light> > comes on on the instrument panel but the battery is brand new and was> > doing it before i replaced the battery. Most of the time, the check> > engine indicator light will also come on as im cranking. Once it> > starts, its rough for about 3 seconds then smooths out. No> > driveability problems though. Any thoughts on this ? It has 48,000> > miles on it . Thanks, David.- Hide quoted text -> > - Show quoted text -REPLY: Thanks for your reply. It doesnt crank any slower...turns at the same speed . The red battery light goes out after it starts.
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Perhaps the fuel pressure regulator is bleeding off fuel pressure.
Probably best to take it in and have it checked.
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